This template tag is a container tag that puts the current commenter's userpic asset in context. Because userpics are stored as assets within Movable Type, this allows you to utilize all of the asset-related template tags when displaying a user's userpic.

Example:

     <mt:CommenterUserpicAsset>
        <img src="<$mt:AssetThumbnailURL width="20" height="20"$>"
            width="20" height="20"  />
     </mt:CommenterUserpicAsset>